you dont seem to understand. They were in all the lanes blocking, so their buddies in the front can stunt. If yo uwant to get pedantic about it all, Regardless of speed limit, you are supposed to move over and allow faster vehicles to pass. That's a concept that the Ontario public cant seem to understand, yet understood in other parts of the country/world etc. Thats a different story though.
These guys were being dooshes
I understand all of that. I am questioning the appropriateness of the response. You have limited choices: be patient (unfamiliar concept to GTA riders and cagers alike); call the police; confront. Confront is hazardous, especially if all you are aiming to do is increase your speed by 15%. Now it is entirely possible that the speed varied up and down but even at 50 confrontation is tricky.